Improvement in casting skeins for wagons



ll'rvTTnn TaTss FaTsNT Preis@ ANDREWT LEONARD, OF KENOSHA, VISCONSIN.

IMPROVEMENT iN CASTING SKEINS FOR WAGONS.

To @Z5 wit/0m, t may concern:

Be it known that l, ANDREw Lnoniinmof the city and county of Kenosha,in the State of \Visconsin, have invented a new and useful method of molding and controlling greenesand cores (made in whole patterns) for thimbleskeins or other hollow conical castings by means of long bars acting in the double capacity otcore-bars and of adjusting or sustaining bars, whereby I secure the true position of the cores in the center of their molds after the patterns are withdrawn, and make the castings both seamless and true when they come from the sand, and thereby preserving the chill or feather on the surface ot' the metal, which (being hard) reduces the friction and increases the wear ot' the skein, while at the same time it enables me to' mold four or more patterns in one iiask, each pattern leaving its own core ot' green sand in vertical position, and thus materially lessening the quantity of sand usually required and cheapening the cost of labor in molding; and I do hereby declare the following to be a i'ull and clear description ot' the saine, reference being had to the accompanying drawings, which make a part ot' this specification.

Figure lis a sectional elevation of an inverted pattern, Z), sustained by a skeleton flask, `o, while the core and core-bar a are molded n p in green sand c, as well as sections 1 and 2 of the flask, and showing also the bottom board, d, with the end ofthe bar a extending through it. t shows the loose collar which forms the mold for the iiange p on the skein. Fig. 2 represents a sectional elevation of a flask and mold after the pattern has been withdrawn, showing the difiiculty heretofore exist ing, and which has prevented the making of hollow conical castings from whole patterns molded in a vertical position, leaving their own cores of green sand, which difficulty is seen at s, the top ot' the core having sprung against one side of the mold. Fig. 3 shows the method of adjusting the core by hand outside of the flask at e; and Fig. 4 shows the extension ot' section 2 of the tlask, with the end of the corebar entirely molded up in solid sand, so as to prevent the core from springing out ot' the eenter of the mold when the pattern is wrapped and withdrawn.

The nature of my invention consists in iirst molding the cores for hollow conical castings around one end of long core-bars inserted in the hollow of whole patterns, and afterward molding solid sand around that portion of the saine bars which extends beyond the base of the pattern, so as to unite the core with the sand which is to form a base for it to stand upon when the iiask is reversed, by which means the long core-bar c (shown in all the figures) enables me to mold thiinble-skeins for wood a-Xles and other hollow conical castings from whole patterns, leaving their own cores ot' green sand, which are secured in the center of their molds after the patterns are withdrawn by the long bars, as shown either in Fig. 3 or Fig. 4. rlhe core-bar a, thus acting in the double capacity of a core-bar and of an adjusting or sustaining bar, overcomes the diificulty heretofore found to exist of the liability of the core (when made of green sand) to spring out oli true in wrapping or withdrawing the pattern, as shown in Fig. 2, and enables me to make seamless castings by molding whole patterns in a vertical position, using green sand for the entire mold and core, by which means I mold a lull set oi' wagon-skeins in each iiask and avoid the risk ol" losing the castings, which is so common in using divided patterns and dry-sand cores as heretofore.

To enable others to make and use my invention, I remark that I iirst provide a skeleton flask, 0, titted totreceive an inverted hollow conical pattern, b, as shown in Fig. l. A loose collar is seen at t. This forms the mold p for a iiange upon the skein. The pattern being thus held, the corebar a is inserted and the core molded around it with green sand, leaving the long bar standing out from the base ot' the pattern. Section 1 ol" the flask may be molded up around the outside of the pattern b to thc center oi' the head atg, where a parting is made in the sand.` Section 2 of the iiask is then molded up with solid sand around that portion oi' the bar standing out from the core, which is thus united with its own base as one body ot' sand, as seen in all the iigu'res. rlhe eore-bar a in Figs. 1 2, and 3 extends through the bottom board, d, so as to control the core or to adj ust it (when necessary) outside of the 'flask by the hand, as shown in Fig. 3.

Fig. 2 shows the flask (which has been reversed) and the mold after the pattern has beenmolded up in section 3 and withdrawn, exhibiting the core inclined against the side of the mold ats,- and Fig. 3 shows the core-bar 2 Mmes in the hand at e, which is in the aet of adjusting the eore, as seen at s.

Fig. 4 shows the extension of section 2 of the flask with the entire end of the Core-bar a molded np in solid sand. It will be seen that this, being properly done, will prevent the core vfrom springing or inelining from the center of the mold when the pattern is wrapped and withdrawn. -c represents the green sand which forms the entire mold and core. The

cope, with the sprue7 is notshown, it not being` considered necessary, as it is well understood. In withdrawing the pattern it will be seen that section 3 olthe flask lifts from the collar at f and section l from the bead at g, carrying with it the loose collar t. The pattern I) is then wrapped and -worked loose and lifted from the Core, leaving it standing on its own base, which, being small relatively with its length, is liable to spring out or' its true position in the mold, as seen in Fig. 2. The cope being left off enables me to see the core at s and to adjust it by the hand, as shown at e, Fig. 3, when the core-bar is not entirely molded up.

The effect of this method of molding greensand cores around one end oi' long bars and ol" securing their true positions in their molds by the other ends of the same bars, as shown in Figs. 3 or 4:, is materially to eheapen the cost of molding and casting hollow eonieal castings, and also to make them seamless and true without chipping or turning, while the quality of the castings is much improved.

Having thus fully described and shown my invention, what I claim as new, and which I desire to secure by Letters Patent of the Unite( States, is

The method, substantially as set forth, of molding and casting thimble-skeins and other hollow conical castings in a vertical position from whole patterns, leaving their own 'cores of green sand, which were molded in the hollow ofthe patterns around one end of long corebars, so arranged and combined with the cores and with Vthe solid sand in the iiask as to have the other end ot' the same bars sustain the eores, or to render them adjustable by hand after the patterns are withdrawn and the mold coinpleted, as specified, and of thus insuring the true position of the eores in the center of their molds and making the castings perfectly true and seamless direct from the sand, substantially as described'and shown.

ANDREW LEONARD.

Xilitnesses:

E. H. KUDEL, F. XV. SGHANKEY. 

